Definition of planisphere in English:

planisphere

Syllabification: plan·i·sphere
Pronunciation: /ˈplanəˌsfi(ə)r
 
/

noun

A map formed by the projection of a sphere or part of a sphere on a plane, especially an adjustable circular star map that shows the appearance of the heavens at a specific time and place.
More example sentences
  • On the third floor of the Paris Observatory Cassini had laid out a planisphere, a map of the World using an azimuthal projection with the North Pole at the centre.
  • Also known as a star wheel, a planisphere is the secret decoder of the sky.
  • Emerging from the whitewashed labyrinth of the Stone Town I found myself looking straight onto a pair of large nineteenth century buildings, both built immediately against the flat blue planisphere of the sea.

Origin

late Middle English planisperie, from medieval Latin planisphaerium, from Latin planus 'level' + sphaera 'sphere'; later influenced by French planisphère.

Derivatives

planispheric

Pronunciation: /ˌplanəˈsfi(ə)rik, -ˈsfer-/
adjective
More example sentences
  • By far the most popular type is the planispheric astrolabe, on which the celestial sphere is projected onto the plane of the equator.

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